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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11aa3211e1e2ba6770498edbeae39981850fc6d4824084bf1c7e0f94700a4c5c' 
  AND token = 'YLhj7f94harkzLIIq2CkpJIQl5b4IPcBTV4/qV0DpwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}